质量为m的物块用压缩的轻质弹簧卡在竖直放置的矩形匣子中如图所示在匣子的顶部和底部都装有压力传感器当匣子随升降机以a=25ms2的 Template




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tomski质量为m的物块用压缩的轻质弹簧卡在竖直放置的矩形匣子中如图所示在匣子的顶部和底部都装有压力传感器当匣子随升降机以a=25ms2的 coloring